P1 = int(input())
P2 = int(input())
N = int(input())
R = [int(input()) for _ in range(N)]
room = [0]*1000
for r in R:
    room[r-1] += 1

cnt = 0
for i in range(1000):
    if room[i] > 1:
        cnt += room[i]-1
print(cnt*(P1+P2))